Double sliding doors



(No Model.)

A. G. BIERBAOH. DOUBLE SLIDING DOORS.

No. 599,490. Patented Feb. 22, 1898.

Inventor. 9 4% Q? Z M Attorneys! Srarns ATlENl tripe.

. ALBERT G. BIERBACII, OF MILWVAUKEE, WISCONSIN.

SPECIFICATION forming part of Letters Patent No. 599,490, dated February 22, 1898.

A li ation fil d June 18, 1897. Serial No. 641,243. (No model.)

To all whom it may concern:

Be it known that I, ALBERT G. BIERBACH, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Double Sliding Doors, of which the following is a specification.

My invention relates to improvements in that class of double sliding doors in which each of the doors is moved alongside of the other when opened and pertains especially to improvements whereby both doors may be hung centrally from the same track or tracks, so that neither will tend to swing away from the point of support.

The object of my invention is to provide door hangings and tracks of a simple and in expensive construction which will permit the doors to be easily moved.

In the following description reference is had to the accompanying drawings, in which- Figure 1 is a side elevation of my invention, showing the upper portion of the doors in the closed position, with a portion of the tubular runway broken away to show the construction of the door-supporting carriages and hanger-bars. Fig. 2 is a top View of the doors, showing the hanger-bars in cross section. Fig. 3 is a section view drawn on line X X of Fig. 1. Fig. l is a section view drawn on line Y Y of Fig. 1, showing the plugged ends of the tubular runway. Fig. 5 is a sect-ion view drawn on line Z Z of Fig. 1. Fig. 6 is a cross-section view of the roller-frame drawn on the line 15 t of Fig. 1.

Like parts are identified by the same reference-letters throughout the several views.

A and B are the doors.

0 is a supporting slotted tubular runway. Each of the doors is supported from the track by hanger-bars D and E, attached to the doors at or near their upper corners, and the doors are so hung from the track that their edges overlap with the hanger-bar D of each door located in a position between the hanger-bars of the other door and in the same vertical plane with the slot in the tubular track. It

is evident that as the bars are attached to the opposing faces of the respective doors the latter are located at equal distances on opposite sides of the supports. The support is therefore a central one for the two doors taken together, and the doors support each other laterally, thus doing away with the necessity for cleats or guideways at the lower ends of the doors.

\Vithin the tubular runway each of the l1anger-bars D is rigidly attached to one end of a horizontal frame F, which is preferably shaped in cross-section like an inverted letter U and provided with slots G, which are fitted with bearings H for the trunnions of the track-rollers I. The rollers are provided with a peripheral flange I, which projects downwardly through the slot in the tubular runway and prevents the rollers from turning in the slot-bearin gs. The frames F of the respective hanger-bars are oppositely disposed, so as to permit the bars to come in contact when the doors are closed. The hangerbars E are attached centrally to a frame J, which is slotted at each end to provide bearings for the rollers K K and has a portion of its side J collapsed or pressed inwardly to facilitate attachment of the hanger-bar, as best shown in Fig. 6. It is obvious, however, that the frames of the outer hanger-bars E E may, if desired, be formed in the same manner as the frames of the inner hanger-bars D D, using but one roller for supporting the outer corner of each door, and thus permitting the doors to lap more completely upon each other when open. It is evident also that where the structure to which the doors are applied will permit the tubular runway or track maybe extended to the right or left to permit both doors to be removed sufiiciently to expose the entire opening or doorway.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

The combination of a slotted overhead track, doors suspended from said track by hangers attached respectively to their opposing faces and projecting through said slots, the inner hangers of each door being located between the hangers of the other doors, and

attached to the ends of oppositely-disposed U shaped roller-bearing fram es, and the outer hangers being attached to the collapsed central portions of similar frames, a pair of rollers for supporting each of the outer frames, and a single roller for supporting each of the inner frames, substantially as described.

In testimony whereof I aifix my signature in the presence of two Witnesses.

ALBERT G. BIERBACH.

Witnesses:

JAs. B. ERWIN, LE ERETT 0. WHEELER. 

